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Scale transform in speech analysis

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4 Author(s)
Umesh, S. ; City Univ. of New York, NY, USA ; Cohen, L. ; Marinovic, N. ; Nelson, Douglas J.

In this paper, we study the scale transform of the spectral-envelope of speech utterances by different speakers. This study is motivated by the hypothesis that the formant frequencies between different speakers are approximately related by a scaling constant for a given vowel. The scale transform has the fundamental property that the magnitude of the scale-transform of a function X(f) and its scaled version √αX(αf) are same. The methods presented here are useful in reducing variations in acoustic features. We show that the F-ratio tests indicate better separability of vowels by using scale-transform based features than mel-transform based features. The data used in the comparison of the different features consist of 200 utterances of four vowels that are extracted from the TIMIT database

Published in:

Speech and Audio Processing, IEEE Transactions on  (Volume:7 ,  Issue: 1 )